Method for reactivating a catalyst for cyclizing hydrolysis of an aminonitrile into a lactam and use of the regenerated catalyst for making lactams
CA 2337327 A1 · Owner: Nedez, Christophe · Inventors: Nedez, Christophe; Brunelle, Jean-Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for reactivating a catalyst for cyclizing hydrolysis of an aminonitrile for making lactams. More particularly it concerns the reactivation of solid catalysts used in processes for producing lactams by cyclizing hydrolysis of aminonitriles. Said reactivating method consists in treating the spent catalyst at a temperature ranging between 300 ·C and 600 ·C with an oxidizing atmosphere.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.